A preloaded stent graft delivery device (100) includes a guide wire catheter (172) having a proximal end, a distal end, and a guide wire lumen (90) therethrough； a nose cone dilator (110) at the proximal end of the guide wire catheter； a handle assembly (123) at the distal end of the guidewire catheter； a thumbwheel (133) rotatably mounted to the handle assembly, the thumbwheel having a ratchet assembly (150) disposed therein； a sheath mount (135) positioned within an interior surface of the handle assembly and coupled to the thumbwheel； a pusher catheter extending from the handle assembly towards the nose cone dilator, the pusher catheter comprising at least one lumen therethrough where the guidewire catheter extends through the at least one lumen within the pusher catheter； a sheath (106) disposed coaxially over the pusher catheter, the sheath at least partially coupled to the sheath mount within the interior surface of the handle assembly.
